Prime Minister Benjamin Netanyahu insinuated in an interview published Friday that Israel cannot entirely rely on the U.S. to act against Iran's suspect nuclear program, a sign that the Israeli leader is not backing down from the sharp rhetoric that strained relations this week with the Obama administration.

Netanyahu has been arguing in recent weeks that Iran is getting close to acquiring nuclear weapons capability, a claim Iran denies. He has been pushing the U.S. to commit to the circumstances under which the U.S. would lead a strike on Iran's nuclear facilities. Netanyahu and other Israeli leaders have repeatedly hinted that if the United States does not attack, Israel will.

"I hear those who say we should wait until the last minute. But what if the U.S. doesn't act? It's a question that must be asked," Netanyahu told Israel Hayom, in an interview marking the Jewish New Year.

. . . The Obama administration also suspects Tehran is seeks to become a nuclear power and says it is committed to preventing a nuclear Iran, but insists more efforts must be made before resorting to military action. Washington is refusing to be specific about what exactly would necessitate a strike on Iran and has rejected an Israeli demand for "red lines" that cannot be crossed.

Earlier this week Netanyahu issued a rebuke of the U.S. cautious stance, perceived as an indirect swipe at the Obama administration. He said that "those in the international community who refuse to put red lines before Iran don't have a moral right to place a red light before Israel."